Vehicle-mounted communication device and navigation device equipped with this vehicle-mounted communication device, communication device for pedestrians and navigation device equipped with this communication device for pedestrians, and pedestrian-to-vehicle communication system

A vehicle-mounted communication device that carries out radio communications with a communication device for pedestrians which is carried by a pedestrian, said vehicle-mounted communication device comprising:

• a receiver that receives pedestrian information showing whether said pedestrian belongs to a pedestrian group formed of said pedestrian and a plurality of pedestrians in a vicinity of said pedestrian from said communication device for pedestrians;
• a controller that judges said pedestrian information received by said receiver, and issues a command to present pedestrian attention information and also issues a command to transmit vehicle approach information showing that said vehicle is approaching when said pedestrian information shows that said pedestrian does not belong to a pedestrian group;
• an information outputter that presents said pedestrian attention information according to the command from said controller;
• and
• a transmitter that transmits said vehicle approach information to a communication device for pedestrians carried by a pedestrian not belonging to said pedestrian group according to the command from said controller.

A communication device for pedestrians that carries out radio communications with a vehicle-mounted communication device mounted in a vehicle, and that is carried by a pedestrian, said communication device for pedestrians comprising:

• a pedestrian information acquirer that acquires pedestrian information showing whether said pedestrian belongs to a pedestrian group formed of said pedestrian and a plurality of pedestrians in a vicinity of said pedestrian;
• an information processor that issues a command to transmit the pedestrian information acquired by said pedestrian information acquirer by using a transmission method of changing a transmission frequency, transmission power, or a transmission priority according to whether said pedestrian information belongs to a pedestrian group;
• and
• a transmitter that transmits said pedestrian information to said vehicle-mounted communication device in response to the command from said information processor.

A pedestrian-to-vehicle communication system that includes a communication device for pedestrians carried by a pedestrian and a vehicle-mounted communication device mounted in a vehicle, and that carries out radio communications between said communication device for pedestrians and said vehicle-mounted communication device, wherein

• said communication device for pedestrians comprises:
• a pedestrian information acquirer that acquires pedestrian information showing whether said pedestrian belongs to a pedestrian group formed of said pedestrian and a plurality of pedestrians in a vicinity of said pedestrian;
• an information processor that issues a command to transmit the pedestrian information acquired by said pedestrian information acquirer by using a transmission method of changing a transmission frequency, transmission power, or a transmission priority according to whether said pedestrian information belongs to a pedestrian group;
• and
• a transmitter that transmits said pedestrian information to said vehicle-mounted communication device in response to the command from said information processor, and wherein
• said vehicle-mounted communication device comprises:
• a receiver that receives said pedestrian information transmitted from the transmitter of said communication device for pedestrians;
• a controller that judges said pedestrian information received by said receiver, and issues a command to present pedestrian attention information and also issues a command to transmit vehicle approach information showing that said vehicle is approaching when said pedestrian information shows that said pedestrian does not belong to a pedestrian group;
• an information outputter that presents said pedestrian attention information according to the command from said controller;
• and
• a transmitter that transmits said vehicle approach information to a communication device for pedestrians carried by a pedestrian not belonging to said pedestrian group according to the command from said controller.